Fix pg_receive_wal_test race condition and handle postgres shutdown NoticeResponse

[Copilot]

wal-verify integrity was running while wal-receive was still actively streaming, causing segments to appear as MISSING_UPLOADING (→ WARNING) instead of FOUND (→ OK). Additionally, wal-receive would crash with "Received unexpected message" when postgres sent a NoticeResponse on shutdown.

Changes

docker/pg_tests/scripts/tests/test_functions/test_receive_wal.sh

• Stop postgres with -m fast before running wal-verify, so all WAL has been generated before checking
• Capture wal-receive PID and wait for it to finish uploading remaining segments before verifying
• Drop the unreliable sleep 1

# Before: verify while still streaming → MISSING_UPLOADING
wal-g wal-receive &
pgbench ...
sleep 1
wal-g wal-verify integrity   # races with active streaming
pg_ctl stop -m immediate

# After: verify after everything is flushed
wal-g wal-receive &
WAL_RECEIVE_PID=$!
pgbench ...
pg_ctl stop -m fast
wait $WAL_RECEIVE_PID || true
wal-g wal-verify integrity

internal/databases/postgres/wal_segment.go

• Add a *pgproto3.NoticeResponse case to processMessage(): log it as a warning and return OK instead of treating it as a fatal unexpected message. Postgres sends this notice before closing a replication connection on clean shutdown.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[FEATURE] replace brotli dependancy with pure go implementation</issue_title>
<issue_description>### What feature would you like?

Currently the brotli dependency is based on the CGO wrapper of brotli (https://github.com/google/brotli/tree/master/go) maybe just for historical reasons.

But now it exists a pure Go implementation https://github.com/andybalholm/brotli that does not need to have all the burden of linking and maintaining the submodule of the CGO wrapper.

Why is this feature useful?

No response</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [FEATURE] replace brotli dependancy with pure go implementation #46

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